How about a 7/8 length slim leg trouser like a cigarette style? There's loads about. Perhaps navy or grey, if you don't want a light colour. Black would be fine too if you had the right top. Floral is also popular at the moment.

Oh I'm thinking about doing this. Will be taking 6mo DS and not sure I can be bothered with the faff of a dress. I was thinking wide-legged navy trousers and some kind of Bardot top (as am bf) but your tapered trousers look lovely!

Trousers or skirt and top are a good idea if breastfeeding i once made the mistake of wearing a dress to a wedding whilst breastfeeding a 3 month old. I spent most of the time the toilet with a dress half undone.